<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        .box{
            height: 50px;
            width: 50px;
            box-shadow:20px 10px 10px blue;
        }
    </style>
</head>
<body>
    <div class="box">woaini!</div>
    <p>haorenyishengpingan</p>
</body>
</html>